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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a4a8f33fd6b58239a207ef15ed55f0d023e1abd614961355343aaa0c0e4565' 
  AND token = 'kyC9XfsngacEI4hAqcOb7x0MERmjZ9zVLk1V43O0deU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}